Has anyone ever seen Penn Extra Duty balls marked with a number as high as 8?

I usually see 1 through 4 on the courts. Recently, a hitting partner showed up with a can of Penn 8's. When he opened the can, the balls were all duds. And the ink stamping looked a unusual (darker than normal, with ragged edges). I wonder if they were counterfeit?

A number of ball brands were numbered through 8 back in the old days(maybe into the '80s). Haven't seen any above 4 in a couple of decades(unless I'm forgetting Gamma in the '90s...not sure if they went above 4 ?). If they were in a plastic 'can', they were newer than 1983...plenty of time to die in the can(even though the can may have held pressure). I would imagine my cans from the '96 Atlanta Olympics would be less than bouncy if I were to open them now.